proc.c

Apache 2.0.63 is the current stable version of the 2.0 series, and is recommended over any previous

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "apr_arch_threadproc.h"
#include "apr_strings.h"
#include "apr_portable.h"
#include "apr_signal.h"

APR_DECLARE(apr_status_t) apr_procattr_create(apr_procattr_t **new,
                                              apr_pool_t *pool)
{
    (*new) = (apr_procattr_t *)apr_pcalloc(pool, sizeof(apr_procattr_t));

    if ((*new) == NULL) {
        return APR_ENOMEM;
    }
    (*new)->pool = pool;
    (*new)->cmdtype = APR_PROGRAM;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_io_set(apr_procattr_t *attr,
                                              apr_int32_t in,
                                              apr_int32_t out,
                                              apr_int32_t err)
{
    apr_status_t status;
    if (in != 0) {
        if ((status = apr_file_pipe_create(&attr->child_in, &attr->parent_in,
                                           attr->pool)) != APR_SUCCESS) {
            return status;
        }

        switch (in) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_in, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_in, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_in, 0);
            apr_file_pipe_timeout_set(attr->parent_in, 0);
        }
    }

    if (out) {
        if ((status = apr_file_pipe_create(&attr->parent_out, &attr->child_out,
                                           attr->pool)) != APR_SUCCESS) {
            return status;
        }

        switch (out) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_out, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_out, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_out, 0);
            apr_file_pipe_timeout_set(attr->parent_out, 0);
        }
    }

    if (err) {
        if ((status = apr_file_pipe_create(&attr->parent_err, &attr->child_err,
                                           attr->pool)) != APR_SUCCESS) {
            return status;
        }

        switch (err) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_err, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_err, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_err, 0);
            apr_file_pipe_timeout_set(attr->parent_err, 0);
        }
    }

    return APR_SUCCESS;
}


APR_DECLARE(apr_status_t) apr_procattr_child_in_set(apr_procattr_t *attr,
                                                    apr_file_t *child_in,
                                                    apr_file_t *parent_in)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_in == NULL && attr->parent_in == NULL)
        rv = apr_file_pipe_create(&attr->child_in, &attr->parent_in, attr->pool);
    
    if (child_in != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->child_in, child_in, attr->pool);

    if (parent_in != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->parent_in, parent_in, attr->pool);

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_child_out_set(apr_procattr_t *attr,
                                                     apr_file_t *child_out,
                                                     apr_file_t *parent_out)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_out == NULL && attr->parent_out == NULL)
        rv = apr_file_pipe_create(&attr->child_out, &attr->parent_out, attr->pool);

    if (child_out != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->child_out, child_out, attr->pool);

    if (parent_out != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->parent_out, parent_out, attr->pool);

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_child_err_set(apr_procattr_t *attr,
                                                     apr_file_t *child_err,
                                                     apr_file_t *parent_err)
{
    apr_status_t rv = APR_SUCCESS;

    if (attr->child_err == NULL && attr->parent_err == NULL)
        rv = apr_file_pipe_create(&attr->child_err, &attr->parent_err, attr->pool);

    if (child_err != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->child_err, child_err, attr->pool);

    if (parent_err != NULL && rv == APR_SUCCESS)
        rv = apr_file_dup2(attr->parent_err, parent_err, attr->pool);

    return rv;
}


APR_DECLARE(apr_status_t) apr_procattr_dir_set(apr_procattr_t *attr,
                                               const char *dir)
{
    attr->currdir = apr_pstrdup(attr->pool, dir);
    if (attr->currdir) {
        return APR_SUCCESS;
    }

    return APR_ENOMEM;
}

APR_DECLARE(apr_status_t) apr_procattr_cmdtype_set(apr_procattr_t *attr,
                                                   apr_cmdtype_e cmd)
{
    attr->cmdtype = cmd;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_detach_set(apr_procattr_t *attr,
                                                  apr_int32_t detach)
{
    attr->detached = detach;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_proc_fork(apr_proc_t *proc, apr_pool_t *pool)
{
    int pid;

    if ((pid = fork()) < 0) {
        return errno;
    }
    else if (pid == 0) {
        proc->pid = pid;
        proc->in = NULL;
        proc->out = NULL;
        proc->err = NULL;

        return APR_INCHILD;
    }

    proc->pid = pid;
    proc->in = NULL;
    proc->out = NULL;
    proc->err = NULL;

    return APR_INPARENT;
}

static apr_status_t limit_proc(apr_procattr_t *attr)
{
#if APR_HAVE_STRUCT_RLIMIT && APR_HAVE_SETRLIMIT
#ifdef RLIMIT_CPU
    if (attr->limit_cpu != NULL) {
        if ((setrlimit(RLIMIT_CPU, attr->limit_cpu)) != 0) {
            return errno;
        }
    }
#endif
#ifdef RLIMIT_NPROC
    if (attr->limit_nproc != NULL) {
        if ((setrlimit(RLIMIT_NPROC, attr->limit_nproc)) != 0) {
            return errno;
        }
    }
#endif
#ifdef RLIMIT_NOFILE
    if (attr->limit_nofile != NULL) {
        if ((setrlimit(RLIMIT_NOFILE, attr->limit_nofile)) != 0) {
            return errno;
        }
    }
#endif
#if defined(RLIMIT_AS)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_AS, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#elif defined(RLIMIT_DATA)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_DATA, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#elif defined(RLIMIT_VMEM)
    if (attr->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_VMEM, attr->limit_mem)) != 0) {
            return errno;
        }
    }
#endif
#else
    /*
     * Maybe make a note in error_log that setrlimit isn't supported??
     */

#endif
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_child_errfn_set(apr_procattr_t *attr,
                                                       apr_child_errfn_t *errfn)
{
    attr->errfn = errfn;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_error_check_set(apr_procattr_t *attr,
                                                       apr_int32_t chk)
{
    attr->errchk = chk;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_addrspace_set(apr_procattr_t *attr,
                                                       apr_int32_t addrspace)
{
    /* won't ever be used on this platform, so don't save the flag */
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_proc_create(apr_proc_t *new,
                                          const char *progname,
                                          const char * const *args,
                                          const char * const *env,
                                          apr_procattr_t *attr,
                                          apr_pool_t *pool)
{
    int i;
    const char * const empty_envp[] = {NULL};

    if (!env) { /* Specs require an empty array instead of NULL;
                 * Purify will trigger a failure, even if many
                 * implementations don't.
                 */
        env = empty_envp;
    }

    new->in = attr->parent_in;
    new->err = attr->parent_err;
    new->out = attr->parent_out;

    if (attr->errchk) {
        if (attr->currdir) {
            if (access(attr->currdir, X_OK) == -1) {
                /* chdir() in child wouldn't have worked */
                return errno;
            }